Pres. Obama took the lead in a series of direct negotiations at Copenhagen with China, India, and others, which lead to the compromise "Copenhagen Accord". Without his intervention, no accord would have been reached.

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President Obama will visit the Copenhagen COP15 Conference on Dec 9, the White House has announced. His speech will contain target reductions for US greenhouse gas emissions by amounts consistent with current legislation. Further details will be added to this article as they become available.

From the WhiteHouse.gov website:

The White House also announced that, in the context of an overall deal in Copenhagen that includes robust mitigation contributions from China and the other emerging economies, the President is prepared to put on the table a U.S. emissions reduction target in the range of 17% below 2005 levels in 2020 and ultimately in line with final U.S. energy and climate legislation. In light of the President’s goal to reduce emissions 83% by 2050, the expected pathway set forth in this pending legislation would entail a 30% reduction below 2005 levels in 2025 and a 42% reduction below 2005 in 2030. This provisional target is in line with current legislation in both chambers of Congress and demonstrates a significant contribution to a problem that the U.S. has neglected for too long. With less than two weeks to go until the beginning of the Copenhagen conference, it is essential that the countries of the world, led by the major economies, do what it takes to produce a strong, operational agreement that will both launch us on a concerted effort to combat climate change and serve as a stepping stone to a legally binding treaty. The President is working closely with Congress to pass energy and climate legislation as soon as possible.